Report of an iala seminar on the Preservation of Lighthouse Heritage Executive Summary


Repair to Reproduce the Centennial Lighthouse, China



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5.3.Repair to Reproduce the Centennial Lighthouse, China


The presentation was made by Jun Fu, China MSA

Presentation abstract

Lingao Lighthouse is located at the Lingao Cape of Hainan Province. Exposed to wind and storms for ages, the tower and some supporting parts suffered from corrosion and damages of various degrees, posing a potential danger to the safety of the tower structure and maintenance operation. The lantern glass was totally destroyed, with the original lantern went out and some structural components inside, like supporting saddle, damaged or lost. When a new lantern was installed on the tower, the original style was undermined. Moreover, the ancillary buildings built afterwards also conflict with the architectural style of the Lighthouse, which not only affected the value of the Lighthouse as a historical relic, but clashed with the landscape of Liberation Park at the Lingao Cape. Therefore, protective repairs of the Lighthouse became necessary. Based on the practice and experience in restoration of Lingao Lighthouse, this paper explores the ideas and methods in repair and preservation of historical lighthouse in China. That is, in brief, to repair the old as the original to reproduce the historical sense of the centennial lighthouse with the purpose of carrying forward the long-established lighthouse culture in China.



The key points of the presentation were:

  1. Corrosion due to exposure to wind and storms.

Damage due to exposure to wind and storms.

Faithful and sympathetic restoration.


5.4.Structural and Earthquake Resistance Design of Masonry Lighthouses


Milton Demosthenous, Frederick University, Cyprus was unable to attend the seminar and no presentation was made

5.5.Overview of session and Q and A


It was asked if at North Foreland lighthouse, had any difference been noted when monitoring humidity and temperature between different facades of the lighthouse i.e. sea facing or away from the sea? It was replied that this had been checked but no differences were found.

It was commented that in Greece the sea facing side of the towers need special attention due to worse conditions. It was also said that the information presented on over ventilation was very interesting.

It was then asked if it is true that thick layers of coating on North Foreland lighthouse prevents the structure from breathing. In response it was said that the building is already impervious due to cement renders and flint construction but that rendering has cracked due to thermal movement and so elastomeric coating has been used on the outside. One future option is to remove existing render inside and apply a lime render.

(equation 6)Session 4 – Building restoration (continued)


This session was chaired by Ioanna Papayianni, Aristotle University of Thessaloniki, Greece.

6.1.Keeping the rain out and the lights on


The presentation was made by Ron Blakely, Trinity House, England and Wales.

Presentation abstract

During the 19th / 20th Centuries there was a vast expansion of the building and refurbishment of lighthouses, which incorporated substantial lantern structures which are still performing as intended to this day other than the fact that the roof intersection with the ventilator in some cases has succumbed to corrosion.

The presentation will discuss the initial investigation, corrosion mechanisms and subsequent repair so as to allow the lantern to perform into the future by protecting the current Aids to Navigation.

The key points of the presentation were:


  1. 19th Century Lanterns.

Corrosion.

Refurbishment.

Repair.

Health & Safety.


6.2.The lighthouse on St. Nicholas tower of the town of Rhodes - Restoration project


The presentation was made by Mrs Katerina Manoussou-Ntella, Hellenic Ministry of Education and Religious Affairs, Culture and Sport, Greece.

Presentation abstract

The historic light standing on the platform of the central tower of Hospitaller Fort St. Nicholas is a landmark of the town of Rhodes and part of the fort's evolution, as it is already present in a 1675 drawing of Cornelius de Bruyn. Originally, it must have been an 'open flame' light which, in 1863, was replaced by the present installation, constructed by the ‘French Company of Ottoman Lighthouses’. The off-centre location of its heavy stone turret, seven metres high, over the spiral staircase of grand master Zacosta (dated 1464), contributed to the gradual dislocation of the stairwell caused by earthquakes, patchy repair and weathering, which often resulted in the almost complete disintegration of the masonry. The resulting danger of collapse threatened the heraldic display and relief figure of St. Nicholas on the tower's face since the 1960s.

Restoration, undertaken by the Ministry of Culture in early 1998, began with the dismantling of the steel lantern and cracked masonry turret. In collaboration with the Navy Lighthouse Service a temporary metal light was placed on the tower and remained in operation until the end of the work. In late 1998 the restoration of the medieval stairwell and staircase were complete, worn stone blocks and treads having being replaced with new ones of the same material. In the required specialist studies the preservation of the lighthouse as an important element of specialized technology was considered obligatory. The turret was rebuilt in its 1863 form, but its foundation was shifted to the top of the solid part of the circular masonry of the tower, which was about 5 metres thick, to the SW of its original position. In late 2006 the restored light was ready for operation in its new location, which poses no threat to the integrity of the medieval monument underneath.

The key points of the presentation were:


  1. General principles of restoration of Historic Monuments.

Techniques of conservation of traditional structures.

Lighthouse history.




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